Dim myEncoding As New System.Text.ASCIIEncoding()
System.IO.File.WriteAllBytes(myXMLFileLocation,
myEncoding.GetBytes(Properties.Resources.AddinUserSettingsXML))
Have you made this directory writeable by /every/ user?
If not, UAC will get in the way on Vista and Windows 7 - directories
outside the user's own hive are usually read-only.
Do you overwrite the file every time your application runs, or only to
first create it?
Why do you need to copy it there anyway?
Do you need to "feed" it to some other program?
If you're only using it within your own code, you can probably find a
way to use the text in the Resource object directly.